const std = @import("std");
const driver_manager = @import("driver_manager.zig");
const api = @import("api.zig");

// FPGA驱动数据结构
const FpgaDriverData = struct {
    // 驱动私有数据
    allocator: std.mem.Allocator,
    device_count: u32,
    initialized: bool,
};

// FPGA设备数据结构
const FpgaDeviceData = struct {
    device_id: u64,
    program_loaded: bool,
    current_bitstream_id: u32,
    operation_status: u32,
    // 其他FPGA设备相关字段
};

// FPGA驱动命令
pub const FPGA_IOCTL_LOAD_BITSTREAM = 0x201;
pub const FPGA_IOCTL_UNLOAD_BITSTREAM = 0x202;
pub const FPGA_IOCTL_EXECUTE_OPERATION = 0x203;
pub const FPGA_IOCTL_GET_STATUS = 0x204;
pub const FPGA_IOCTL_SET_CONFIG = 0x205;

// FPGA位流信息
const FpgaBitstreamInfo = struct {
    bitstream_id: u32,
    bitstream_path: [256]u8,
    size: u64,
    // 其他位流相关信息
};

// FPGA操作请求
const FpgaOperationRequest = struct {
    bitstream_id: u32,
    input_buffer: u64, // 物理地址
    output_buffer: u64, // 物理地址
    input_size: u64,
    output_size: u64,
    operation_params: [64]u8,
};

// FPGA设备状态
const FpgaStatus = struct {
    device_id: u64,
    is_busy: bool,
    loaded_bitstreams: u32,
    memory_usage: u64,
    temperature: u32,
    power_consumption: u32, // mW
};

// FPGA配置参数
const FpgaConfig = struct {
    frequency: u32, // MHz
    power_mode: u8, // 0: 省电, 1: 平衡, 2: 高性能
    memory_limit: u64, // 字节
    io_voltage: f32, // V
};

// 初始化驱动
fn init_driver(allocator: std.mem.Allocator, driver_data: *anyopaque) bool {
    std.log.info("FPGA driver initialized");
    
    // 分配驱动数据
    const fpga_data = allocator.create(FpgaDriverData) catch {
        std.log.err("Failed to allocate FPGA driver data");
        return false;
    };
    
    fpga_data.* = FpgaDriverData{
        .allocator = allocator,
        .device_count = 0,
        .initialized = true,
    };
    
    // 存储驱动数据
    @atomicStore(*anyopaque, driver_data, fpga_data, .Release);
    return true;
}

// 清理驱动
fn deinit_driver(driver_data: *anyopaque) void {
    const fpga_data = @ptrCast(*FpgaDriverData, @alignCast(@alignOf(FpgaDriverData), driver_data));
    std.log.info("FPGA driver deinitialized");
    fpga_data.allocator.destroy(fpga_data);
}

// 探测设备
fn probe_device(device_info: *driver_manager.DeviceInfo) bool {
    // 检查是否为FPGA设备
    std.log.info("FPGA driver probing device: VID={x}, PID={x}", .{device_info.vendor_id, device_info.device_id});
    
    // 这里我们假设FPGA设备的类ID范围是0x090000到0x09FFFF
    if (device_info.class_id >= 0x090000 and device_info.class_id <= 0x09FFFF) {
        std.log.info("FPGA device matched");
        return true;
    }
    
    return false;
}

// 移除设备
fn remove_device(device_id: u64) void {
    std.log.info("FPGA driver removing device: {d}", .{device_id});
    // 这里应该清理与该设备相关的所有资源
}

// IO控制
fn ioctl_device(device_id: u64, cmd: u32, data: *anyopaque, size: u64) isize {
    std.log.info("FPGA driver IOCTL: device={d}, cmd={x}, size={d}", .{device_id, cmd, size});
    
    switch (cmd) {
        FPGA_IOCTL_LOAD_BITSTREAM => {
            if (size < @sizeOf(FpgaBitstreamInfo)) {
                return -1; // 缓冲区太小
            }
            
            const bitstream_info = @ptrCast(*FpgaBitstreamInfo, @alignCast(@alignOf(FpgaBitstreamInfo), data));
            std.log.info("Loading bitstream: ID={d}, Path={s}", .{bitstream_info.bitstream_id, &bitstream_info.bitstream_path});
            
            // 模拟位流加载过程
            std.log.info("Bitstream loaded successfully");
            return 0;
        },
        
        FPGA_IOCTL_UNLOAD_BITSTREAM => {
            if (size < @sizeOf(u32)) {
                return -1; // 缓冲区太小
            }
            
            const bitstream_id = @ptrCast(*u32, @alignCast(@alignOf(u32), data));
            std.log.info("Unloading bitstream: ID={d}", .{bitstream_id.*});
            
            // 模拟位流卸载过程
            std.log.info("Bitstream unloaded successfully");
            return 0;
        },
        
        FPGA_IOCTL_EXECUTE_OPERATION => {
            if (size < @sizeOf(FpgaOperationRequest)) {
                return -1; // 缓冲区太小
            }
            
            const request = @ptrCast(*FpgaOperationRequest, @alignCast(@alignOf(FpgaOperationRequest), data));
            std.log.info("Executing FPGA operation: Bitstream ID={d}", .{request.bitstream_id});
            std.log.info("Input: addr={x}, size={d}", .{request.input_buffer, request.input_size});
            std.log.info("Output: addr={x}, size={d}", .{request.output_buffer, request.output_size});
            
            // 模拟操作执行
            std.log.info("FPGA operation completed successfully");
            return @sizeOf(u64); // 返回操作结果大小
        },
        
        FPGA_IOCTL_GET_STATUS => {
            if (size < @sizeOf(FpgaStatus)) {
                return -1; // 缓冲区太小
            }
            
            const status = @ptrCast(*FpgaStatus, @alignCast(@alignOf(FpgaStatus), data));
            status.device_id = device_id;
            status.is_busy = false;
            status.loaded_bitstreams = 1;
            status.memory_usage = 1024 * 1024 * 64; // 假设使用了64MB内存
            status.temperature = 70; // 假设温度为70°C
            status.power_consumption = 5000; // 假设功耗为5000mW
            
            return @sizeOf(FpgaStatus);
        },
        
        FPGA_IOCTL_SET_CONFIG => {
            if (size < @sizeOf(FpgaConfig)) {
                return -1; // 缓冲区太小
            }
            
            const config = @ptrCast(*FpgaConfig, @alignCast(@alignOf(FpgaConfig), data));
            std.log.info("Setting FPGA config: Freq={d}MHz, PowerMode={d}, MemLimit={d}MB, IOVoltage={d}V", 
                .{config.frequency, config.power_mode, config.memory_limit / (1024 * 1024), config.io_voltage});
            
            // 模拟配置设置
            std.log.info("FPGA config updated successfully");
            return 0;
        },
        
        else => {
            std.log.info("Unknown FPGA IOCTL command");
            return -1; // 未知命令
        },
    }
}

// FPGA驱动接口
pub const fpga_driver_interface = driver_manager.DriverInterface{
    .name = "fpga_driver",
    .description = "Field Programmable Gate Array driver",
    .version = 1,
    .init = init_driver,
    .deinit = deinit_driver,
    .probe = probe_device,
    .remove = remove_device,
    .ioctl = ioctl_device,
};